Phonographic needle



May 5, I925. 1,536,739

H. A BRASSARD PHONOGRAPHIC NEEDLE Filed .Ma'rch 19, 1920 Ill/I 11/ l 11/ INVENTOR I 5 6, L MM m m flaw ATTORNEYS.

Patented May 5 19 i ,umvrsm s HENRY A BRASSABD, 0E

PA rant OFFICE CLEVELAND, 01110, nssienon 0E ONE-HALE 'ro'rnomas J.

DUGAN, or cLEvELAnn, omo. I j

rHonoeEAPnIo NEEDLE.

Application filed March 19, 1920. Serial No. 367,062.

To all whom it may concern:

Be it known that I, HENRY A; BRAssARD, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Phonographic Needles, of which the following is a full,

clear, and exact description.

The present invention relates to aneedle intended for use in the reproduction ot sound in COIIIIGCtlOIL with a phonographicrecord.

The object of the presentinvention is to provide a needle which will transmit the vibrations which .the needle receives from traveling over the phonographic record, to the sound reproducer in such a fashion that these vibrations are undampened and free ing the present invention; Fig. 2 is alongitudina]. sectional elevation of a needle and Fig. 3 is a transverse section on the line A--A of Fig. 2. r

As shown in the drawing, the needle consists essentially of a body portion such as indicated at l, the forward portion of the body being grooved as indicated at 2 to form a V-shaped portion havingthe sidewalls 3 I and 4 which intersect in a lower edge 5. These walls as shown in Fig. 3are slightly concave so as to provide a more acute edge at 5.. At the end of the needle the walls are sheared in a slanting direction as indicated in Fig. 2 so that the extreme forward point at the end of the needle is formed by the intersection of slanting planes at an acute angle. I

The body of the needle is preferably formed of steel and when the point becomes dulled from use the needle may be sharpened by merely rubbing a honing stone along the slanting surface at the end, this action merely removing a part of the metal and restores the point to its initial sharpness.

' The walls 3 and 4 are necessarily thin and are free to vibrate as the needle is used.

Secured at one end of the needle is a tongue 6. This tongue is as before stated.

secured at one end and otherwiseunsecured so that it is free to vibrate. The width of the tongue 7 is slightly less than the width between the upper edge of the walls 3 and 4.

, The tongue is preferably, made of bronze.

As the needle is used in reproducing from a phonographic record, vibration is set up in the walls 3 and 4 as well as in the tongue 6 and these vibrations are in '-a measureamplified by the combined interaction of the Y walls 3 and 4 and the tongue 6 so that the vibrations which reach the sound box of the reproduc ng mechanism are clear and distinct and of much greater intensity than i the vibrationswhich are produced by a solid needle of the usual type. The foregoing action results lnthe production ofa clearer, louder and more resonant sound from the sound box than can be reproduced by the The form of the of a triangular point than a round point.

needle as indicated at l in the drawings may be modified in form to fit any particular form of needle holder.

Having described my invention, I claim 1. A phonographic needle having side walls which converge and form an edge which extends throughout the length of said side walls, the other edges of said side walls beingfree to vibrate.

2. A phonographic needle, the body portion of which is provided with walls, one edge of which is free to vibrate, and a tongue extending between the said edges.

length, but where desirable the end of the 3. A phonographic needle having slanting walls which converge, the said walls having an edge which is free to vibrate and a tongue which is also free to vibrate ex- 5 tending between said walls.

4. Aphonogmphic needle having a body portion which in section is a hollow V-shape and a tongue secured at one end to the body of the needle and extending between the HENRY A BRASSARD. 

